According to Andrew Dunbar <hippietrail@yahoo.com>:
> Here is a workaround for 1550. I can't call this an actual fix
> since we really need to rethink the relationships between filetypes,
> importers, exporters, file extensions, and the SaveAs dialog.
>
> But now we'll be doing the write thing in 99.99% of cases. I think
> will also fix the bug about auto-saved backups not being loadable.